Patent US4315874A successfully refreshed from Google Patents.
US4315874A
Expired / Lapsed
US
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Process for the production of spherical carrier particles for olefin polymerization catalysts
Assignee: Mitsui Chemicals Inc
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Filing: 1980-04-07
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Granted: 1982-02-16
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Expires: 2000-04-07
Abstract
Abstract This invention provides a process for producing spherical carrier particles for olefin polymerization catalyst, which comprises (i) forming a suspension of molten droplets of an adduct of a halogen-containing magnesium compound and an active hydrogen-containing organic compound in an organic liquid medium in the presence of at least one oil soluble surface-active agent as an auxiliary component, and (ii) quenching the resulting suspension to solidify the adduct particles.
Inventors
- 👤 Yoshihisa Ushida
- 👤 Yoshikatu Amimoto
- 👤 Akinori Toyota
- 👤 Norio Kashiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:19
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/04; C08F10/06; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
A process for producing spherical carrier particles for olefin polymerization catalyst, which comprises (i) forming a suspension of molten droplets of an adduct of a halogen-containing magnesium compound and an active hydrogen-containing organic compound selected from the group consisting of alcohols having 1 to 18 carbon atoms, phenols having 6 to 15 carbon atoms, organic carboxylic acids having 1 to 18 carbon atoms and amines having 1 to 16 carbon atoms, in an organic liquid medium selected from the group consisting of hydrocarbons, halogenated hydrocarbons, and ethers in the presence of at least one oil soluble surface-active agent as an auxiliary component, and (ii) quenching the resulting suspension to solidify the adduct droplets.
Claim 2
Dependent Claim
113 words
A process for producing spherical carrier particles for olefin polymerization catalyst, which comprises (i) forming a suspension of molten droplets of an adduct of a halogen-containing magnesium compound and an active hydrogen-containing organic compound selected from the group consisting of alcohols having 1 to 18 carbon atoms, phenols having 6 to 15 carbon atoms, organic carboxylic acids having 1 to 18 carbon atoms and amines having 1 to 16 carbon atoms, in an organic liquid medium selected from the group consisting of hydrocarbons, halogenated hydrocarbons, and ethers in the presence of at least one oil soluble surface-active agent as an auxiliary component, and (ii) quenching the resulting suspension to solidify the adduct droplets.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein said quenching is performed by contacting the suspension with an organic liquid medium having a temperature low enough to solidify the molten adduct droplets.
Claim 4
Dependent Claim
34 words
The process of claim 2 wherein the temperature of said organic liquid medium to be contacted with the suspension is at least about 10° C. lower than the melting point of said adduct droplets.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein said halogen-containing magnesium compound is selected from the group consisting of magnesium dihalides and complexes thereof.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein said oil soluble surface-active agents are nonionic surface-active agents.
Claim 7
Dependent Claim
18 words
The process of claim 5 wherein said nonionic surface-active agents have an HLB of less than about 6.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein the amount of said surface-active agents used is about 0.5 to about 20 g per liter of said organic liquid medium.
References Cited (Backward Citations)
GB1271411A
Cited
GB1434543A
Cited
GB1433537A
Cited
GB1452314A
Cited
GB1502886A
Cited
GB1505315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-15 | 1985-08-17 | 1986-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-15 | 1989-08-17 | 1990-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-15 | 1993-08-17 | 1994-02-16 | $7700.00 | Window Closed / Lapsed |